Geochemistry of Y plus REE in stratiform tourmalinites and their tourmalines: implications for their genesis
| Authors | |
|---|---|
| Year of publication | 2013 |
| Type | Article in Proceedings |
| Conference | MINERAL DEPOSIT RESEARCH FOR A HIGH-TECH WORLD, VOLS. 1-4 |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | Y plus REE; tourmaline; stratiform tourmalinites; Bohemian Massif |
| Description | Yttrium+REE contents in stratiform tourmalinites and their tourmaline from two different geological units, Svratka Unit and Krkonose-Jizera Unit (Bohemian Massif, Czech Republic) are reported to reveal tourmalinite genesis and tourmaline growth history. Premetamorphic tourmaline grains rimmed by younger metamorphic schorl-dravite were distinguished in both regions. The wing-shaped Y+REE patterns with minimum close to Eu in premetamorphic oxy-dravite from the Krkonose-Jizera Unit, and the Y+REE whole rock signature indicate important contribution of seawater in the oxy-dravite forming fluids. On the contrary, Y+REE patterns in premetamorphic schorl cores from the Svratka Unit correspond well to presumable exhalative origin of B-bearing fluids. Metamorphic rims of schorl-dravite at both regions show typically LREE-enriched patterns with pronounced positive Eu anomalies reflecting composition of metamorphic fluids. |
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